Cmos differential amplifier stage with bulk isolation

Details Cmos differential amplifier stage with bulk isolation Cmos differential amplifier stage with bulk isolation

H - Electricity

03

F

330/20

H03F 3/45 (2006.01)

Patent

CA 1238694

- 6 - CMOS DIFFERENTIAL AMPLIFIER STAGE WITH BULK ISOLATION Abstract An MOS differential input stage circuit (10) includes first (M1) and second (M2) differential input transistors with input nodes at their gates and output nodes at their drains. The sources are connected to a first current source (24). A second pair of differential transistors (M3,M4) which have their sources connected to a second current source (28), their drains connected to a reference voltage node, and their gates common to the respective first differential input transistors, have their bulk regions in common with the bulk regions (20) of the first differential transistors for isolation from supply voltage noise and from common mode input signal effects.

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